import pygame.font
from pygame.sprite import Group
from ship import Ship

class Scoreboard():
    "显示得分信息的类"
    def __init__(self, ai_settings, screen, stats):
        "初始化显示得分涉及的属性"
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.ai_settings = ai_settings
        self.stats = stats
        # 显示得分信息时使用的字体设置
        self.text_color = (30, 30, 30)
        self.font = pygame.font.SysFont(None, 48)
        # 准备初始得分图像
        self.prep_score()
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()

    def prep_ships(self):
        "显示还剩余多少搜飞船"
        self.ships = Group()
        for ship_number in range(self.stats.ships_left):
            ship = Ship(self.ai_settings, self.screen)
            ship.rect.x = 10+ship_number*ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)
    def prep_level(self):
        "将等级转换为要渲染的图像"
        self.level_image = self.font.render(str(self.stats.level),True,self.text_color,self.ai_settings.bg_color)
    #    将等级放在得分下面
        self.level_rect = self.level_image.get_rect()
        self.level_rect.right = self.score_rect.right
        self.level_rect.top = self.screen_rect.bottom+10


    def prep_high_score(self):
        "将最高分转换成要渲染的图像"
        high_score = int(round(self.stats.high_score,-1))
        high_score_str = "{:,}".format(high_score)
        self.high_score_image = self.font.render(high_score_str,True,self.text_color,self.ai_settings.bg_color)
    #     将最高分放在屏幕顶部中央
        self.high_score_rect = self.high_score_image.get_rect()
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = self.screen_rect.top

    def prep_score(self):
        "将得分转换成为一幅渲染的图像"
        # 函数round()通常让小数精确到小数点后多少位，其中小数位数是由第二个实参指定的。
        # 然而，如果将第二个实参指定为负数，round()将圆整到最近的10、100、1000等整数倍。

        rounded_score = int(round(self.stats.score,-1))
        score_str = "{:,}".format(rounded_score)
        self.score_image = self.font.render(score_str,True,self.text_color,self.ai_settings.bg_color)
        # 将得分放在屏幕右上角
        self.score_rect = self.score_image.get_rect()
        self.score_rect.right = self.screen_rect.right -20
        self.score_rect.top = 20

    def show_score(self):
        "在屏幕上显示得分和最高分"
        self.screen.blit(self.score_image, self.score_rect)
        self.screen.blit(self.high_score_image, self.high_score_rect)
        self.screen.blit(self.level_image,self.level_rect)
#         绘制飞船
        self.ships.draw(self.screen)

